Punch-holder.



W. A. CORNBROOKS,

PUNCH HOLDER.

APPLICATION FILEDYJUNE 1!, m7.

1 {Q47 Patented Nov. 20, 1917. 2 SHEETSSHEET lf g? 0" 5L W. A. CORNBHOOKS.

PUNCH HOLDER- APPLICATION men mm: 11. I917.

' Patented Nov. 20, 191?.

2 SHEETS-SHEET 2.

llTE @TATEd WILLIAM A, BR K on omma, rumors, asslcivoaro \VILLIAMS, Wn rn &

coiviralvr, or nonnvnanmnors, ooaroaarron or ILLINOIS.

roncrnnornna.

. Specification of Letters Patent.

Patented ov. 20, 191?.

Application filed June 11,. 1917. Ser l No. 173,936.

To all whom it may concern:

Be it known that I, WILL AM A. CORN- BROOKS, a citizen ofthe United States, residing at Moline, in the county of Rock Island and State of Illinois, have invented certain new and useful Improvements in Punch-Holders, of which the following isa specification. V

This invention relates to improvements in punching apparatus and more particularly to a holder for adj ustably securing a punch to the movable ram.

One of the objects of my invention is to provide a punchholder easily applicable to a ram or head from the front side thereof and adapted to be securely locked in position by a single bolt. r

Another object is to secure the holder to the ram by connections positioned at each side of the center line of'the punch and adapted to resist vertical strain in both dire'ctions.

A still further object is the provision of a clamping bolt arranged to press the holder upwardly against the-ram,preventing separation of these parts and at the-same time tending to draw the holder to one side maintaining the opposite engaging parts of the ram and holder in tight 'contac Other objects of the invention are the provision of a holder of ruggedsturdy construction well adapted to resist the punishment to which apparatus of thischaracter is subjected and which may be easily and quickly adjusted from one position to another on the ram or detached or attached thereto.

Still other and further objects will become apparent to those skilled in this art from a consideration of the following description and drawing, wherein Figure 1 is a side elevation of a portion of a punching machine showing my improved punch holders mounted thereon, and;

Fig. 2 is a transverse sectional view on the line 22 of Fig. 1.

Punching machines of the general character to which my invention relates comprise in general two parts namely the bed or table upon which the die is mounted and the reciprocating ram upon which the punch member is carried. The punches are secured to the ram by holders permitting attachment or detachment therefrom as well as longitudinal adjustment to permit Suitable spacing of the holes in the material to be punched.

In the drawings, wherein I have illustrated a preferred form of my invention applied to a two row punch, thenumeral 10 indicates a punch bed upon which is mounted a die 11 adapted to cooperate with the punch 12' carried upon the power reciprocated ram 13. Between the rows of punches is mounted a bar 10 from which project stripper fingers 13 adapted to overlie the work and facilitate the withdrawal of the punches. Upon the lower face of the ram 13 is mounted a bolster 14: having depending from each side thereof, this being a two ro punch, longitudinally extending ribs 15 to which are attached the punch holders indicated in general by the numeral 16. This arrangement permits the use of a double row or gang of punches at each side of the ram, as is quite common in this type of machine.

The undersides of the ribs 15 are flat as at 17 and the punch holders 16 of generally rectangular form have their upper surface correspondingly flat for engagement with the surface 17 on the head. The central portion of the upper surface of the punch holder is cut away at 18 to form a channel opening 'to the front of the holder and in which is positioned the slidable 19. The forward end of the gag overlies the upper end of the "punch 12 when the former is pushed inwardly, this being the position occupied by the gag when power is to be transmitted from the ram to the head of the punch. WVhen the stop 19 is retracted to the position indicated in dotted lines in Fig. 2, a clear space is provided above the upper end of the punch 12 to permit reciprocation of the ram without transmitting its force to the punch proper.

Forwardly and rearwardly extending flanges 20 and 21 project from the lower portion of the ribs 14; for the attachment of the holders. The rear of the punch holder is extended upwardly, as at 22, and at its upper end is provided with a lip 23 which extends over the top of the rear flange or shoulder 21 of the rib for engagement therewith. A diagonal opening 24 extends through the forward portion of the punch holder to receive the diagonally disposed bolt 25, the upper end of which is hooked over, as at 26, for engagement with the outpr flange or shoulder 20 of the rib 14. A nut 27 is screw threaded on the lower end of the bolt 25 to clamp the holder in position.

From the above it will be evident that before the bolt 25 is inserted in place the holder is free for horizontal inward movement to disengage the shoulder 23 from the flange 21, to permit the removal or attachment of the punch. lVhen the bolt 25 is insorted in position and drawn tight by the nut 27 the holder is securely clamped against the under side of the bolster and at the same time is drawn to the left so as to form a tight contact between the lip 23 of the holder and theflange 21 of the rib 15. Loosening the bolt 24 loosens the engagement between the holder and the ram. and permits longitudinal adjustment to any desired position.

-VVhereas I have illustrated and described but a single embodiment of my invention it will be evident to those skilled in the art that modifications or alterations may be made therein without departure from the spirit of the invention or the scope of the ap ended claims.

aving described my invention, what I claim is 1. A punching machine comprising a ram having oppositely extending shoulders on the front and back thereof, a punch holder for attachment to the ram and having an integral upstanding hook like extension at its rear for engagement with the rear shoulder, the front portion of the holder lying entirely below the front shoulder, and detachable clamping means on the front portion of the holder for engagement with the front shoulder.

2; A punching machine comprising a ram having oppositely extending shoulders on copies oft-his patent may be obtained for the front and back thereof, a punch holder for attachment to the ram and having an integral upstanding hook like extension at its rear for engagement with the rear shoulder, the front portion of the holder lying entirely below the front shoulder, and abolt extending through the front portion of the holder and having its upper end portion hook shaped for engagement with the front shoulder.

3. A punching machine comprising a ram having oppositely extending shoul ers on the front and back thereof, a punch holder for attachment to the ram and having a hook like extension at its rear for engage- K ment with the rear shoulder, thefront portion of the holder lying entirely below the front shoulder, and a bolt extending diagonally upwardly and outwardlythrough the front portion ofthe holder and having its upper end portion hook shaped for engagement withthe front shoulder.

' 4. A punching machine comprising a ram having oppositely extending flanges projecting from the front and back lower edge portions thereof, a punch holder having an integral hook extending upwardly and outwardly from its back portion for engagement with the rear flange, and a bolt projecting upwardly through the forward portion of the holder and having its upper end portion shaped for clamping engagement with the front flange.

In testimony whereof I hereunto set my hand in the presence of two subscribing witnesses. I 7

WILLIAM A. CORNBROOKS. In the presence of CLARENCE W. FISKE, JOHN U. HIoKoK.

five cents each, by addressing the Commissioner of Patents, Washington, .D. 0. 

